Insulator



Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE WALTER T. GODDAR-D, GF HAMILTON, ONTARIO, CANADA, ASSIGNOR- TO LGCKE INSU- LATOR CORFORATION, F BALTIMORE, MARYLAND, A CORPORATION OF MARYLAND INSULATOR Application filed December 4, 1922. Serial No. 604,736.

The invention relates to insulators and more particularly to insulators of the pin type. The principal object of the invention, generally stated, is to provide a connection between the insulator and its supporting pin which will permit of the ready assembly of the insulator and pin at the point of application of the insulator'.

Another object of the invention is to provide an insulator with a thimble composed of a pair of telescoping members, the said thimble being adapted to be connected to the insulator so as to permit the ready assembly or detachment of the insulator from the supporting pin at the place of use.

A still further object of the invention is to provide a pin receiving thimble composed of a plurality of telescoping members, said members being spaced apart so as to provide an expansion joint between the pin and the adjacent dielectric material of the insulator.

To these and other ends the invention comprises the various elements and combinations of elements hereinafter set forth, the novel features being pointed out in the claims.

ligure 1 is a transverse vertical sectional view of a pin type insulator and its support embodying the invention, the pin and support being illustrated in full lines.

Figure 2 is a transverse vertical sectional view of the thimble embodying my invention.

Referring to the drawings, the numeral 1 designates an insulator of a well known de- O'n and comprises a plurality of insulating unitsrigidly connected to each other. The insulating units are designated for convenience as 2, 3 and 4, and comprise a cap member in which is formed the line wire groove 5 and the tie wire groove 6. Nested within the cavity 7 of the cap member 2 is a head S of the intermediate member 3, and nested within the cavity 9 of the intermediate member 3 is the cap or head 10 of the base memn ber 4. The various units are shown as connected by a cementitious compound 11. lVithin the head 10 of the base member 4 is formed a downwardly opening preferably screw-threaded recess 12 to provide means for operatively connecting the insulator to the insulator support-ing pin 13.

The insulator supporting pin extends through the supporting member or arm 14 and is provided on opposite sides of the bar member 14 with a base member 15 and a nut 16 to firmly maintain the pin in position. At its upper end the pin 13 is formed with a screw-threaded portion 17 and at a point below the screw-threaded portion there is preferably provided a shoulder 18. rllhe shoulder 18 may be formed by reducing the diameter of the upwardly extending screwthreaded portion of the pin 13.

To connect the pin 13 to the insulator 1, l provide a double-walled thimble generally designated as 19, said thimble comprising a pair of counterpart telescoping metallic members 20 and 21. Each of the members 20 and 21 is preferably formed from a noncorrosive metal or from a metal rendered non-corrosive by sheradizing or some analogous process, and comprises a thimble of substantially uniform diameter having impressed in the circumference thereof a continuous screw-threaded portion 22 which terminates short of the open ends of each of the members 20 and 21. The member 21 is of suoli size as to loosely lit within the member 2G and is arranged so that when the members are in assembled position the screwthreaded portions thereof serve to interlockm ingly connect the same. The unthreadcd portions of the inner member 21 being of greater size than the inner diameter of the thread 22 of the outer member 2O serves to limit the relative longitudinal movement of the two members. rlhe length of the inner member' 21 is such that when the limit of movement thereof within the outer member 2O is reached, the lower edges of the members 2O and 21 preferably lie in the same plane while their closed top portions are slightly spaced apart, as clearly shown in Figure 2. To maintain the members in proper assembled position, I preferably provide projections 23 on the member 2O which engage within correspondingly formed recesses 24 in the member 21.

The thimble 19 is adapted to be connected to the insulator' either by being screwed therein or by being attached thereto by cement, as desired, prior to the shipment of the insulator. The screw threads 22 on the inner member 21 are adapted to mate with the screw threads 17 of the standard pin and it will be readily apparent that the insulator and pin thus formed can be assembled by rotating the insulator about the pin in the proper direction. The open ends of the thimble 19 are ada ted to engage the shoulder 18 on the pin to limit the inward movement of the pin within the inner member 21 of the thimble. This shoulder is so arranged that the upper end of the pin is spaced from the closed end of the inner member 22 of the thimble.

It will be observed that when the parts are assembled there is space provided between the inner member 21. and the outer member 20v of the thimble, which space will adequately compensate for dierences in the co-eilicient of expansion and contraction of the porcelain andthe metallic pin and will prevent detrimental strains being transmitted from the pin to the insulator.

I claim:

1. A thimble for mounting an insulator upon a pin, comprising a. pair of similar telescopically engaged threadedly connected members, one fitting snugly up0n.the pin and the other being secured firmly within the insulator, the threaded portions terminating short off the ends to provide stop means iimiting reiative longitudinal movement, and means normally maintaining the members against relative rotative movement.

2. A thirnble for mounting an insulator upon a pin, comprising a pair of similar members formed with pressed screw threads being adapted to be firmly embedded within the insulator and the other being adapted to be screwed snugly upon the pin, said mem# bers conforming to each other and spaced apart throughout their threaded portionsfor permitting expansion of the parts.

5v A, thimble for mounting an insulator upon a pin, comprising a pair of similar members formed with screw threads interengaged to provide a lock, one member being adapted to be firmly embedded within the insulator and the other conforming to and being adapted to be screwed snugly upon the pin, said members corresponding to each other and being equally spaced apart throughout their threaded portions to permit expansion of the parts.

In testimony whereof I ax my signature.

VALTER T. GQDDARD.

interengaged to provide a lock, one member being adapted to be firmly embedded within the insulator and the other being adapted to be screwed snugly upony the pin, said members having a space therebetween for rmi'tting expansion of the parts, the threads on both members terminating short of the ends thereof te limit relative longitudinal movement.

3. A thimble for mounting an insulator upon a pin, comprising a pair of similar members formed with pressed screw threads interengaged to provide a lock, one member being adapted to be firmly embedded within the insulator and the other being adapted to be screwed snugly upon the pin, said members having a space therebetween for permitting expansion of the parts, the threads on both members terminating short of the ends thereof to limit relative longitudinal movement, and said members being formed with coacting indentations normally engaging to prevent relative rotative movement.

4. A thimble for mounting an insulator upon a pin, comprising a pair of similar members formed with pressed screw threads interengaged to provide a lock, one member 

